What type of boiler

[Lincsandy]

I am looking to install an underfloor heating system in part of a large glasshouse.

I intend to buy an oil fired boiler to run the system.
Looking for advise as to what type of boiler to go for as I dont need any hot water for anything other than the underfloor heating system.

Any advise would be really appreciated.

 

[dilalio]

What is this "large glasshouse"?
Is it connected to a house?
Open walled to house or exterior doors?
What's its purpose?
Why do you need it heated?

These answers will help with advice.

 

[Lincsandy]

It is a bed inside a large glasshouse.
It is a bed for rooting cuttings.
There will be 2 beds 13mtrs x 2mtrs each.
The beds will have polystyrene insulation with the heating pipes laid on top and then 1.5 to 2 inches of sand on top, Then trays of cuttings are placed on top of the sand and covered with polythene. There is a small shed inside the glasshouse to put the boiler in.

 

[dilalio]

OK. So it's for purposes other than domestic heating.

Be careful when mentioning "beds"!
On here that usually means the kind that people sleep in!

Is this a business you are running or a hobby thing?

What do similar setups use for this purpose? There must be others that have required such arrangements and I would imagine there are forums directly related to this subject.

Have you researched based on "best way to heat greenhouses/glasshouses for cultivating" or similar?

You will get a lot of heat loss through the fabric of the building and there will definitely be regs for commercial setups of this nature.

 

[Lincsandy]

I guess what i really needed to ask was what type of boiler can be used to run just heating without hot water supply.

 

[foxhole]

I guess what i really needed to ask was what type of boiler can be used to run just heating without hot water supply.

Any boiler.

 

[Nige F]

A small output one that's happy running @ low temp. for the UFH. Can't help more because I last worked with wallflame oil boilers

 

[bernardgreen]

I would think that with 13 metre long beds some care in the design of the pipe work would be needed to mimimise temperature differences along the bed.

Otherwise the cuttings at one end of the bed could be growing faster than those at the other end of the bed.

 

[dilalio]

I guess what i really needed to ask was what type of boiler can be used to run just heating without hot water supply.

A "heat only" boiler... Or regular boiler.
But any can be used and it may be useful to have a hot water supply also, for cleaning etc.
You could also look at lpg as it may be more practical than oil... Getting supplies etc!

 

[HERTS P&D]

All the info is in the link below:

https://dutch-passion.blog/growing-cannabis-in-a-greenhouse/



Andy

 

[Lincsandy]

I've just looked at an old system like I am trying to build in a old derelict glasshouse.
It was a heat only boiler running on gas.
Simple pipework just one cold water feed/expansion tank and pump to circulate the water. No need for separate hot water cylinder.

 

[dilalio]

All the info is in the link below:

https://dutch-passion.blog/growing-cannabis-in-a-greenhouse/



Andy

Have to admit... My thoughts were wandering to that conclusion also!
Maybe it's me!

 

[dilalio]

I've just looked at an old system like I am trying to build in a old derelict glasshouse.
It was a heat only boiler running on gas.
Simple pipework just one cold water feed/expansion tank and pump to circulate the water. No need for separate hot water cylinder.

But if you get a combi, you can have instantaneous HW also, without the need for a cylinder!

And the mains feed for the f&e tank can just be fed straight into the combi, with a filling loop for topping pressure up!

 

[Lincsandy]

Have to admit... My thoughts were wandering to that conclusion also!
Maybe it's me!

The hotbed is for rooting shrub cuttings I am afraid to say different varieties of pittosporum. Nothing exciting